154k views
3 votes
Solve -2x² - 16x - 44 = 0.

a) x = 8 + √6
b) x = 8 + 21√6
c) x = 4i√6
d) x = 4 + 2i√6

User Sa
by
7.6k points

1 Answer

4 votes

Final answer:

Using the quadratic formula to solve the equation -2x² - 16x - 44 = 0, we find that there are two complex solutions. The correct solutions are x = -4 ± 4i√6. The correct answer is not one of the provided options.

Step-by-step explanation:

To solve the quadratic equation -2x² - 16x - 44 = 0, we can use the quadratic formula which is given by -b ± √b² - 4ac over 2a. In this case, a = -2, b = -16, and c = -44. Substituting these values into the quadratic formula we get:

x = √(-16)² - 4(-2)(-44) over 2(-2)

After simplifying, we obtain:

x = 16 ± √(256 - 352) over -4

x = 16 ± √(-96) over -4

Since the discriminant (the value inside the square root) is negative, we have no real solutions and two complex solutions. The final solutions have the form:

x = 16 ± 4i√6 over -4

Therefore, the solutions are x = -4 ± 4i√6. This corresponds to option (c) x = 4i√6, but with the correct sign, making option (c) incorrect. The correct answer, accounting for the sign, is not listed among the options provided by the student.

User Gihansalith
by
7.6k points